CVE-2021-20023SonicWall Email Security Path Traversal Vulnerability

SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host.

4.9 MEDIUMEPSS 51.68%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-10-01 21:17 UTC

OverviewCVSS details

4.9MEDIUMCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Apr 20, 2021
Assigner: sonicwall

Affected

Email Security (SonicWall)

Versions: 10.0.9 and earlier

Exploitation

Public exploit: None listed
CISA KEV: Listed · Nov 3, 2021
KEV due date: Nov 17, 2021
Ransomware use: Known
SSVC: Exploitation active · Automatable yes · Impact total

EPSS · FIRST, scored Nov 7

51.68%chance of exploitation in 30 days

Higher than 98.95% of CVEs

CVSS 3.1 · NVD

4.9Medium

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Attack vector: Network
Attack complexity: Low
Privileges required: High
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: None
Availability impact: None

CVSS 2.0 · NVD

4.0Medium

AV:N/AC:L/Au:S/C:P/I:N/A:N

Attack vector: Network
Attack complexity: Low
Authentication: Single
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
4.9	MEDIUM	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
4.0	MEDIUM	2.0NVD	AV:N/AC:L/Au:S/C:P/I:N/A:N

CISA required action

⚡ Known exploited · remediation due Nov 17, 2021

Apply updates per vendor instructions.

Details

CVE ID: CVE-2021-20023
Status: Analyzed
Assigner (CNA): sonicwall
Published: Apr 20, 2021
Last modified: 2026-10-01 21:17 UTC
Weaknesses: CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 09:49 UTC.